[3/3] OMAP2+: powerdomain: add pwrdm_can_ever_lose_context()

Commit Message

Paul Walmsley March 8, 2011, 2:15 a.m. UTC

None

Patch

diff --git a/arch/arm/mach-omap2/powerdomain.c b/arch/arm/mach-omap2/powerdomain.c
index eaed0df..a11be81 100644
--- a/arch/arm/mach-omap2/powerdomain.c
+++ b/arch/arm/mach-omap2/powerdomain.c
@@ -2,7 +2,7 @@ 
  * OMAP powerdomain control
  *
  * Copyright (C) 2007-2008 Texas Instruments, Inc.
- * Copyright (C) 2007-2009 Nokia Corporation
+ * Copyright (C) 2007-2011 Nokia Corporation
  *
  * Written by Paul Walmsley
  * Added OMAP4 specific support by Abhijit Pagare <[e-mail]>
@@ -938,3 +938,44 @@  u32 pwrdm_get_context_loss_count(struct powerdomain *pwrdm)
 
 	return count;
 }
+
+/**
+ * pwrdm_can_ever_lose_context - can this powerdomain ever lose context?
+ * @pwrdm: struct powerdomain *
+ *
+ * Given a struct powerdomain * @pwrdm, returns 1 if the powerdomain
+ * can lose either memory or logic context or if @pwrdm is invalid, or
+ * returns 0 otherwise.  This function is not concerned with how the
+ * powerdomain registers are programmed (i.e., to go off or not); it's
+ * concerned with whether it's ever possible for this powerdomain to
+ * go off while some other part of the chip is active.  This function
+ * assumes that every powerdomain can go to either ON or INACTIVE.
+ */
+bool pwrdm_can_ever_lose_context(struct powerdomain *pwrdm)
+{
+	int i;
+
+	if (IS_ERR_OR_NULL(pwrdm)) {
+		pr_debug("powerdomain: %s: invalid powerdomain pointer\n",
+			 __func__);
+		return 1;
+	}
+
+	if (pwrdm->pwrsts & PWRSTS_OFF)
+		return 1;
+
+	if (pwrdm->pwrsts & PWRSTS_RET) {
+		if (pwrdm->pwrsts_logic_ret & PWRSTS_OFF)
+			return 1;
+
+		for (i = 0; i < pwrdm->banks; i++)
+			if (pwrdm->pwrsts_mem_ret[i] & PWRSTS_OFF)
+				return 1;
+	}
+
+	for (i = 0; i < pwrdm->banks; i++)
+		if (pwrdm->pwrsts_mem_on[i] & PWRSTS_OFF)
+			return 1;
+
+	return 0;
+}
diff --git a/arch/arm/mach-omap2/powerdomain.h b/arch/arm/mach-omap2/powerdomain.h
index 0b7a357..027f40b 100644
--- a/arch/arm/mach-omap2/powerdomain.h
+++ b/arch/arm/mach-omap2/powerdomain.h
@@ -2,7 +2,7 @@ 
  * OMAP2/3/4 powerdomain control
  *
  * Copyright (C) 2007-2008, 2010 Texas Instruments, Inc.
- * Copyright (C) 2007-2010 Nokia Corporation
+ * Copyright (C) 2007-2011 Nokia Corporation
  *
  * Paul Walmsley
  *
@@ -34,17 +34,14 @@ 
 
 /* Powerdomain allowable state bitfields */
 #define PWRSTS_ON		(1 << PWRDM_POWER_ON)
+#define PWRSTS_INACTIVE		(1 << PWRDM_POWER_INACTIVE)
+#define PWRSTS_RET		(1 << PWRDM_POWER_RET)
 #define PWRSTS_OFF		(1 << PWRDM_POWER_OFF)
-#define PWRSTS_OFF_ON		((1 << PWRDM_POWER_OFF) | \
-				 (1 << PWRDM_POWER_ON))
 
-#define PWRSTS_OFF_RET		((1 << PWRDM_POWER_OFF) | \
-				 (1 << PWRDM_POWER_RET))
-
-#define PWRSTS_RET_ON		((1 << PWRDM_POWER_RET) | \
-				 (1 << PWRDM_POWER_ON))
-
-#define PWRSTS_OFF_RET_ON	(PWRSTS_OFF_RET | (1 << PWRDM_POWER_ON))
+#define PWRSTS_OFF_ON		(PWRSTS_OFF | PWRSTS_ON)
+#define PWRSTS_OFF_RET		(PWRSTS_OFF | PWRSTS_RET)
+#define PWRSTS_RET_ON		(PWRSTS_RET | PWRSTS_ON)
+#define PWRSTS_OFF_RET_ON	(PWRSTS_OFF_RET | PWRSTS_ON)
 
 
 /* Powerdomain flags */
@@ -211,6 +208,7 @@  int pwrdm_pre_transition(void);
 int pwrdm_post_transition(void);
 int pwrdm_set_lowpwrstchange(struct powerdomain *pwrdm);
 u32 pwrdm_get_context_loss_count(struct powerdomain *pwrdm);
+bool pwrdm_can_ever_lose_context(struct powerdomain *pwrdm);
 
 extern void omap2xxx_powerdomains_init(void);
 extern void omap3xxx_powerdomains_init(void);